My only love, sprung from my only hate!
Too early seen unknown, and known too late!
Prodigious birth of love it is to me
That I must love a loathed enemy. (I.5.139-142)

This quote is important to the play because this is when Juliet learns that Romeo is a Montague and she realizes her loving him would not be accepted due to their families hatred. Juliet knows that she can not stop loving Romeo because she loves him so much already and to stop loving him because of his name is too hard.

2.But soft! What light through yonder window breaks?
It is the East, and Juliet is the sun!
Arise, fair sun, and kill the envious moon,
Who is already sick and pale with grief
That thou her maid are far more fair than she. (II.2. 2-6)

This quote is important because Romeo is comparing Juliet to the sun that brightens his world. The sun shows up many times in the play to show that he is always thinking of her but when the sun sets he is no longer happy.

3. What's in a name? That which we call a rose
By any other word would smell as sweet. (II.2 .43-44)

Juliet is wondering what is in a name, what does a name have to do with who she falls in love with, why does Romeo's name restrict her from loving him. If he had any other name her loving him and marrying him would be fine.

4. See what a scourge is laid upon your hate,
That heaven finds means to kill your joys with love. (V.3. 292-293)

If the two families do not stop fighting then they will have to pay the price and be killed.

5. These violent delights have violent ends
And in their triumph die, like fire and powder,
Which, as they kiss, consume. (II.6.9-11)

Friar Lawrence is telling Romeo that he needs to relax and not fall in love so suddenly because he can end up getting hurt the sooner he rushes into commitment with Juliet then if he takes his time.

6. No, 'tis not so deep as a well, nor so wide as
a church door; but 'tis enough, 'twill serve. Ask for
me to-morrow and you shall find me a grave man. I am
peppered, I warrant, for this world. A plague o'both
your houses! (III.1.94-98)

Mercutio is saying that his wound is not that deep or wide but if you ask him tomorrow he will be dead and curses both the Montague and Capulet families because they fight and they have taken his life from him.

7. O son, the night before thy wedding day
Hath Death lain with thy wife. There she lies,
Flower as she was, deflowered by him.
Death is my son-in-law, Death is my heir;
My daughter he hath wedded. I will die
And leave him all. Life, living, all is Death's. (IV.5.35-40)

Lord Capulet tells Paris about Juliet's "death" on the day they were going to get married. Now that Juliet is "dead" her and Paris can no longer get married.

I fear, too early; for my mind misgives
Some consequence, yet hanging in the stars,
Shall bitterly begin his fearful date
With this night's revels and expire the term
Of a despised life, closed in my breast,
By some vile forfeit of untimely death.
But he that hath the steerage of my course
Direct my sail! On, lusty gentlemen! (I.4.106-113)

Romeo was about to eter the Capulet's party and thought that something was going to happen to him tonight, whether it was good or bad it was going to change his life forever.